diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 9fe8ae2dd938..8b7b107cf2ce 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2786,6 +2786,8 @@ static int drm_cvt_modes(struct drm_connector *connector,
 
 		height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2;
 		switch (cvt->code[1] & 0x0c) {
+		/* default - because compiler doesn't see that we've enumerated all cases */
+		default:
 		case 0x00:
 			width = height * 4 / 3;
 			break;
@@ -2798,8 +2800,6 @@ static int drm_cvt_modes(struct drm_connector *connector,
 		case 0x0c:
 			width = height * 15 / 9;
 			break;
-		default:
-			unreachable();
 		}
 
 		for (j = 1; j < 5; j++) {